$\begingroup$Thank you. Here's another image: thumbs.dreamstime.com/z/red-paint-blob-white-2915277.jpg I'm having an issue getting the edges right where it meets the surface it's on. In this second image, you can see that there's this slightly bulging, surface tension effect where it meets the surface it's sitting on.$\endgroup$
– John NMar 20 '19 at 23:03